Patent application number | Description | Published |
20090003601 | ALPHA-MASKED IMAGE MATCHING - A method and system is disclosed for authenticating a physical medium ( | 01-01-2009 |
20090021551 | METHOD OF MEASURING PRINTER CHARACTERISTICS | 01-22-2009 |
20090021552 | METHOD OF MEASURING PRINTER CHARACTERISTICS | 01-22-2009 |
20100149247 | NOZZLE FUNCTIONALITY DETECTION OF INKJET PRINTERS | 06-17-2010 |
20100156987 | METHOD OF MEASURING PRINTER SPATIAL CHARACTERISTICS | 06-24-2010 |
20130142396 | ESTIMATION OF SHIFT AND SMALL IMAGE DISTORTION - Disclosed is method of measuring the displacement between a reference region of a reference image and a sample region of a sample image. The method spatially varies the reference region using a one-dimensional filter having complex kernel values, wherein a length (radius) and direction (angle or tangent segment) of the filter is a function of position in the reference region. The method then measures a displacement between the reference region and the sample region by comparing the spatially varied reference region and the sample region. | 06-06-2013 |
20130266210 | DETERMINING A DEPTH MAP FROM IMAGES OF A SCENE - Methods for determining a depth measurement of a scene which involve capturing at least two images of the scene with different camera parameters, and selecting corresponding image patches in each scene. A first approach calculates a plurality of complex responses for each image patch using a plurality of different quadrature filters, each complex response having a magnitude and a phase, assigns, for each quadrature filter, a weighting to the complex responses in the corresponding image patches, the weighting being determined by a relationship of the phases of the complex responses, and determines the depth measurement of the scene from a combination of the weighted complex responses. | 10-10-2013 |
20130279805 | IMAGE RESAMPLING BY FREQUENCY UNWRAPPING - A method determines at least one image value of a corresponding desired output position of an output image from an input image. An orientation of an edge passing through the output position is determined in a localised region of the input image. A frequency spectrum for the region of the input image is extended. A main frequency band of the edge is aligned in the extended frequency spectrum parallel to a first sampling axis of a grid based on the orientation of the edge. The grid is selected from a set of the input and output grids. The aligned main frequency band is filtered along a second sampling axis of the grid, orthogonal to the first sampling axis, the filter removing frequencies associated with replica bands and maintaining the main frequency band. The image value is determined from the filtered edge at the desired output position. | 10-24-2013 |
20140153692 | Combining Differential Images by Inverse Riesz Transformation - A method forms a representative image from a crossed grating fringe pattern interferogram of an object from an interferometer. The method determines a plurality of spectral lobes from the interferogram and selects from the plurality of determined lobes, two substantially orthogonal sidelobes. The selected sidelobes represent spatial differential phase information of the interferogram. The method applies an inverse Riesz transform to the spatial differential phase information of the selected sidelobes to form a transformed differential phase image, and forms from the transformed differential phase image, a representative image emphasising high frequency detail information of the object. | 06-05-2014 |
20140369623 | Estimating phase for phase-stepping algorithms - A method of determining an actual phase offset of a fringe pattern in a captured image. A captured image, having a phase modulated fringe pattern, is one of a set of images captured with varying introduced phase offset and forms an intermediate demodulation image from the captured image. The intermediate demodulation image defines amplitude and complex phase parameters of the phase modulated fringe pattern. The captured image is transformed by a mask to produce a processed captured image having reduced effects of phase distortion. The mask is estimated from a function of at least one of the amplitude and complex phase parameters defined by the intermediate demodulation image. The method determines a Fourier transform of the processed captured image, and determines at least one phase offset of the fringe pattern in the processed captured image using the mask to identify interaction of peaks in the Fourier transform. | 12-18-2014 |